| H A D | memguard.c | 03412565 Thu Feb 10 22:36:05 GMT 2005 Bosko Milekic <bmilekic@FreeBSD.org> Implement support for buffers larger than PAGE_SIZE in MemGuard. Adds
a little bit of complexity but performance requirements lacking (this is
a debugging allocator after all), it's really not too bad (still
only 317 lines).
Also add an additional check to help catch really weird 3-threads-involved
races: make memguard_free() write to the first page handed back, always,
before it does anything else.
Note that there is still a problem in VM+PMAP (specifically with
vm_map_protect) w.r.t. MemGuard uses it, but this will be fixed shortly
and this change stands on its own.
03412565 Thu Feb 10 22:36:05 GMT 2005 Bosko Milekic <bmilekic@FreeBSD.org> Implement support for buffers larger than PAGE_SIZE in MemGuard. Adds
a little bit of complexity but performance requirements lacking (this is
a debugging allocator after all), it's really not too bad (still
only 317 lines).
Also add an additional check to help catch really weird 3-threads-involved
races: make memguard_free() write to the first page handed back, always,
before it does anything else.
Note that there is still a problem in VM+PMAP (specifically with
vm_map_protect) w.r.t. MemGuard uses it, but this will be fixed shortly
and this change stands on its own.
03412565 Thu Feb 10 22:36:05 GMT 2005 Bosko Milekic <bmilekic@FreeBSD.org> Implement support for buffers larger than PAGE_SIZE in MemGuard. Adds
a little bit of complexity but performance requirements lacking (this is
a debugging allocator after all), it's really not too bad (still
only 317 lines).
Also add an additional check to help catch really weird 3-threads-involved
races: make memguard_free() write to the first page handed back, always,
before it does anything else.
Note that there is still a problem in VM+PMAP (specifically with
vm_map_protect) w.r.t. MemGuard uses it, but this will be fixed shortly
and this change stands on its own.
03412565 Thu Feb 10 22:36:05 GMT 2005 Bosko Milekic <bmilekic@FreeBSD.org> Implement support for buffers larger than PAGE_SIZE in MemGuard. Adds
a little bit of complexity but performance requirements lacking (this is
a debugging allocator after all), it's really not too bad (still
only 317 lines).
Also add an additional check to help catch really weird 3-threads-involved
races: make memguard_free() write to the first page handed back, always,
before it does anything else.
Note that there is still a problem in VM+PMAP (specifically with
vm_map_protect) w.r.t. MemGuard uses it, but this will be fixed shortly
and this change stands on its own.
03412565 Thu Feb 10 22:36:05 GMT 2005 Bosko Milekic <bmilekic@FreeBSD.org> Implement support for buffers larger than PAGE_SIZE in MemGuard. Adds
a little bit of complexity but performance requirements lacking (this is
a debugging allocator after all), it's really not too bad (still
only 317 lines).
Also add an additional check to help catch really weird 3-threads-involved
races: make memguard_free() write to the first page handed back, always,
before it does anything else.
Note that there is still a problem in VM+PMAP (specifically with
vm_map_protect) w.r.t. MemGuard uses it, but this will be fixed shortly
and this change stands on its own.
03412565 Thu Feb 10 22:36:05 GMT 2005 Bosko Milekic <bmilekic@FreeBSD.org> Implement support for buffers larger than PAGE_SIZE in MemGuard. Adds
a little bit of complexity but performance requirements lacking (this is
a debugging allocator after all), it's really not too bad (still
only 317 lines).
Also add an additional check to help catch really weird 3-threads-involved
races: make memguard_free() write to the first page handed back, always,
before it does anything else.
Note that there is still a problem in VM+PMAP (specifically with
vm_map_protect) w.r.t. MemGuard uses it, but this will be fixed shortly
and this change stands on its own.
03412565 Thu Feb 10 22:36:05 GMT 2005 Bosko Milekic <bmilekic@FreeBSD.org> Implement support for buffers larger than PAGE_SIZE in MemGuard. Adds
a little bit of complexity but performance requirements lacking (this is
a debugging allocator after all), it's really not too bad (still
only 317 lines).
Also add an additional check to help catch really weird 3-threads-involved
races: make memguard_free() write to the first page handed back, always,
before it does anything else.
Note that there is still a problem in VM+PMAP (specifically with
vm_map_protect) w.r.t. MemGuard uses it, but this will be fixed shortly
and this change stands on its own.
03412565 Thu Feb 10 22:36:05 GMT 2005 Bosko Milekic <bmilekic@FreeBSD.org> Implement support for buffers larger than PAGE_SIZE in MemGuard. Adds
a little bit of complexity but performance requirements lacking (this is
a debugging allocator after all), it's really not too bad (still
only 317 lines).
Also add an additional check to help catch really weird 3-threads-involved
races: make memguard_free() write to the first page handed back, always,
before it does anything else.
Note that there is still a problem in VM+PMAP (specifically with
vm_map_protect) w.r.t. MemGuard uses it, but this will be fixed shortly
and this change stands on its own.
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